Basic Velocity Check

We seem to have an issue with some users browsers (internet exploder) submitting multiple requests at once. So I added this simple velocity check, do you guys have any suggestions?

I made the resolution in days just to play it safe. Typically these "inspections" are only ordered once every 3-6 years.


  /**

   * check to make sure that this inspection request is not being spammed

   * 

   * @param type $form 

   */

  private function velocityCheck($form)

  {

    return !Inspection::model()->exists('lastName=:lastName AND addressOne=:addressOne AND type=:type AND TO_DAYS(dateAdded) != TO_DAYS(NOW())', array(

      ':lastName'=>$form->lastName,

      ':addressOne'=>$form->addressOne,

      ':zip'=>$form->zip,

      ':type'=>$form->type));

  }